The launch of the 323-ton private brig rigged yacht Pantaloon at Troon in 1831 for the Duke of Portland, marks the opening of the final and contentious ‘Symonds’ era in British wooden hull naval architecture. Designed for the duke by Captain William Symonds RN it was immediately acquired by the Royal Navy as a fast armed ocean-going dispatch boat. After Symond’s controversial appointment as Surveyor of the Navy the following year, it was regularly pitted in sea rating trials against old and new designs, culminating in its inclusion in the gruelling 1844-46 Experimental Squadron trials. Either side of this engagement it served in the dangerous Preventative Service cruising the West Coast of Africa to intercept fast slavers trading to Cuba and Brazil. After serving with Pantaloon was decommissioned in 1852.

1831 年，波特兰公爵在特伦下水了 323 吨的私人双桅帆船Pantaloon，标志着英国木船船体造船业最后一个充满争议的“西蒙兹”时代的开始。由威廉·西蒙兹 RN 船长为公爵设计，它立即被皇家海军收购为一艘快速武装远洋派遣船。在 Symond 次年被有争议地任命为海军测量员后，它经常在海上评级试验中与新旧设计进行较量，最终将其纳入 1844-46 年艰苦的实验中队试验。在这次接触的任何一方，它都在危险的预防服务处服役，巡航非洲西海岸，以拦截与古巴和巴西交易的快速奴隶贩子。与Pantaloon一起上桌后 1852 年退役。